My pet peave is the superhacker kid that can do anything to any computer with largely random keystrokes. It's gotten even more annoying lately because they always show the screen now and there's never any text on the screen, just where are these keystrokes going in a 100% GUI interface.
Superhackers are annoying, but it's no worse than super villians whose budgets exceed the U.S. military.
I'v always wondered how much it would cost to hire a technical consultant to iron out the technical dialog. there really ought to be a fact checking profession in Hollywood. A few minutes spent on dialog could make a movie worth a lot more 10 or 20 years down the road, and moviemakers are starting to think about such things.